Touch Display Lens Layer for Luminance and Processing Efficiency
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Solution Overview
Problem
Touch display devices face a trade-off between luminance efficiency and processing efficiency, with existing methods often requiring additional mask processes that can damage light emitting elements and compromise performance, especially in outdoor use.
Innovation Solution
A touch display device with a lens layer made of polytriazine or materials like titanium dioxide and zirconium dioxide, processed at low temperatures, which improves luminance efficiency without additional mask processes, and includes a lens protecting layer with a lower refractive index to enhance light concentration and output efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an additional mask process is added to improve luminance efficiency, then luminance efficiency is improved, but processing efficiency deteriorates
Solution Approach 1:
The patent merges the lens layer formation process with the existing touch electrode formation process. The lens layer is formed simultaneously with the touch electrode pattern using the same mask process, eliminating the need for an additional separate mask process. This integration maintains processing efficiency while achieving improved luminance efficiency through the lens layer's light concentration effect.
Solution Approach 2:
The lens layer serves multiple functions: it acts as both a light concentration element to improve luminance efficiency and as part of the touch electrode structure. By making the lens layer integral to the touch electrode formation process, the patent achieves multi-functionality that resolves the contradiction between improving luminance efficiency and maintaining processing efficiency.
2Illumination intensity
If a mask process is added to form a lens layer, then luminance efficiency is improved, but light emitting elements may be damaged
Solution Approach 1:
The patent performs preliminary protection of the light emitting elements by forming the lens layer at a low temperature (below the damage threshold of the light emitting elements) before any high-temperature processes that might cause damage. The lens layer material and formation process are specifically selected to ensure compatibility with the light emitting elements' temperature constraints.
Solution Approach 2:
The patent changes the temperature parameter of the lens layer formation process to be below the damage threshold of the light emitting elements. By controlling the formation temperature within a safe range, the patent achieves lens layer formation without compromising the integrity of the light emitting elements, thus resolving the contradiction between improving luminance efficiency and maintaining element reliability.
3Manufacturing precision
If processing temperature is increased to improve lens layer formation, then lens layer quality is improved, but light emitting elements are damaged
Solution Approach 1:
The patent optimizes the formation temperature parameter to a specific low-temperature range that is sufficient to create an effective lens layer structure without exceeding the damage threshold of the light emitting elements. This parameter optimization resolves the contradiction by finding the optimal temperature window that ensures both lens layer quality and element safety.
Solution Approach 2:
The patent employs composite material selection for the lens layer, using materials that can achieve the desired optical properties and structural quality at lower processing temperatures. This material selection enables high-quality lens layer formation without subjecting the light emitting elements to damaging high temperatures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures improved luminance efficiency without deteriorating processing efficiency, minimizing damage to light emitting elements and enhancing light output across various viewing angles, as demonstrated by increased light extraction and output efficiency measurements.
Implementation Method 1
a plurality of lens layers having a convex shape and disposed inside one touch electrode of the plurality of touch electrodes
Implementation Method 2
a refractive index of the lens protecting layer can be lower than a refractive index of the lens layer
Data Source
AI summary
A touch display device includes a base substrate having a display area and a non-display area, a plurality of light emitting elements disposed in the display area, an encapsulation layer dispose to cover the plurality of light emitting elements, a plurality of touch electrodes having a mesh shape and disposed on the encapsulation layer, and a plurality of lens layers having a convex shape and disposed inside the touch electrode while being disposed on the encapsulation layer.